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i' (No Model.) l W. E. LAWRENCE.

Woon BORING MACHINE. No. 256337. y Patented Apr. 11, 1882.

Y wffww@ UNrTED STATES PATENT Orme WILLIAM E. LAVVRENGE, OF NEW YORK, N.Ya

`wooo-130mm; MACHINE.

SPECIFICATION forming perf ef Lettere Patent Ne. 256,337, dated April11, 1882.

' Application filed J annar'y 27, 1882. (No model.)

To all whom t't muy concern:

Be it known that l, WILLIAM E. LAWRENCE,

a citizen ot' the United States, and a resident of the city, county, andState ot' New York, have invented certain Improvementsin Wood- BoringMachines, of which the following is a specication.

My invention relates to that class of woodboring machines in which anauger is carried by a traveling frame, and the latter is raised bymeansot' a rack gearing with a pinion on the driving-shaft; and myinvention has for its object to simplify the construction and increasethe efficiency ot' the machine.

In the drawings, Figure l is a sectional elevation, and Fig. 2 a frontelevation, of a boring machine with my improvements.

The base A, sido pieces,B B', sliding frame l C, boring-bar D, anddriving-shaft E, both turning in bearings of said frame, and thebevelgears a a. on the bar and shaft, are all similar to thoseinordinary machines of this kind,and need not be here further described.

Upon the shaft is fixed a toothed pinion, b, and on the inside oftheside pieceB, opposite said pinion, is arranged a raclbar, F, having atthe back edge three lugs, d d'f, the center lug, f, being perforatedtoreceive an eccentric pin, e, upon a cylinder, G, turning in a hole intheside piece, and provided at the outer end with a crank-handle, g,whereby it may be turned so as to carry .the bar to or from the pinionb.

It will be seen that the motion `im parted to the bar is in a curve, forwhich reason I makethe guideslots t' in the lugs d d' also curved, saidslots receiving stationary pins n, project ing from the side piece. Bythis construction the bar is locked in whichever position it isadjusted. Thus when turned to the position 4o shown in Fig. 1 its teethengage With those of the pinion b, andthe boring-bar frame is raised byturning the driving-shaft, and the pressure upon the bar in anydirection cannot force it back and away from contact with the pinion,owing to the peculiar form of the lock-slots.

. By a single movementof the hand the handle'g may be turned to theposition shown in Adotted lines, when the `bar will be carried away fromthe pinion, and will be locked se- 5o curely in this position until thehandle-is again swung forward.

It will be seen that when the bar is carried back it is so Far removedat all points from the pinion b that it cannot engage therewith untilthe rock'cylinder is again turned.

I claim- The combination, in a boring-machine, of the sliding frame,carrying the geared boringbar, and driving-shaft provided with a fixed6o pinion, b, and a rack-bar, F, having curved slots t', receiving pinsn., projecting from the side piece, and a rocking cylinder, Gr,yprovided with a handle, and with a pin, e, fitting a socket in therack-bar, substantially as set forth.

In testimony whereof I have signed my name to this specification-in thepresence oftwo subscribing witnesses.

WILLIAM E. LAWRENCE.

Witnesses:

Jos. A. WHITMORE, SAMUEL KILPATRIGK.

